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PASTURE-TYPE ALFALFA TRIAL

The pasture-type alfalfa trial seeded in 1972 was clipped for yield for the third season in 1975. Two clippings were made on all varieties. Stands on all varieties continued to be very good, although some of the plots showed appreciable damage from ground squirrels. Bait was placed in the burrows, but control was not complete.

The clipping yields from the alfalfa plots in the 1975 season are given in Table 7. Yields were very good with the second clipping averaging over 75 % of the first clipping. These yields were of course reflections of the good rainfall picture for the 1975 season. In the 1974 season the yield of the second clipping averaged only about 18% of the first clipping. The average yields of the varieties were the highest obtained in any of the three seasons of the trial.

In the 1975 season 9 of the 12 varieties averaged over 3 tons per acre with only Drylander and two of the Swift Current synthetics averaging less than 3 tons per acre. These three varieties all averaged over 2 3/4 tons/acre. Of the varieties producing over 3 tons/acre Ladak was the top producer at 6651 lbs total yield, and SC-Syn 3703-L at 6148 lbs was the lowest producer. The range between the top-yielding was thus only about 500 lbs/acre.

Regrowth after cutting was appreciably slower in some varieties than in others. Regrowth in Travois, SC-Syn 3701-L, and Semi-Palatinsk was significantly slower than in the other varieties, but total final production for the second clipping was not much different from the production of the other varieties. Regrowth on Travois was quite fine and appreciably shorter than the regrowth of any of the other varieties.

Total yields of the varieties for each of the three years of the trial and average yields for the period are given in Table 8. Actually there is little real difference between the average total production of the first five varieties, the range being only from 6651 lbs/acre for Ladak to 6359 lbs for Roamer. The 3-year average yield of Travois at 6496 lbs/acre is near the yields of the top producers. On the basis of the anticipated behavior of a pasture-type alfalfa Travois seems to be reasonably typical.

To date none of the varieties has exhibited a strong creeping habit. While some of the varieties may have the capability of developing the creeping habit, it is unlikely that this characteristic will be exhibited in this trial, since the treatment of the plots has been that of clipping rather than grazing. Vigor in all varieties seems to be relatively high, and thus far stand maintenance has been good.

Table 7. Production of varieties in pasture-type alfalfa trial - 1975 season.
Variety Dry-weight yield - lbs/acre
1st clipping 2nd clipping Total
Ladak 3563 3088 6651
Teton 3692 2883 6575
Travois 3700 2796 6496
SC-Syn 37045 3727 2701 6428
Roamer 3657 2702 6359
Semi-Palatinsk 3435 2844 6279
SC-Syn 37025 4037 2195 6232
Rambler 3492 2671 6163
SC-Syn 3703-L 3670 2478 6148
Drylander 3292 2483 5775
SC-Syn 3701-L 3001 2687 5688
SC-MF 3713 3281 2235 5516
Average 3546 2647 6193

 

Table 20 - Barley variety trial - Dickinson and off-station sites
Variety Yield in bushels per acre
Dickinson Beach Bowman Glen Ullin Hettinger Killdeer Mandan Avg. 6-station
Hector 61 47 36 42 44 Hailed
Out
22 46
Vanguard 45 46 31 46 40 24 42
Steptoe 49 50 24 31 38 21 38
Firlbecks III 55 48 39 48 42 21 46
Multum 64 45 39 48 49 24 49
Georgie 61 44 32 40 43 16 44
Nordic 52 42 18 33 33 28 36
Standard error of a treatment mean 2.9 1.8 1.7 1.6 1.4 0.9  
L.s.d. @ 5% 8.2 5.3 5.1 4.7 4.0 2.7  
The c.v. = P.C. 10.9 7.9 11.0 7.7 6.6 8.3  

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